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Doldrums
Not Always Negative
Though often used for unwanted inactivity, 'doldrums' can reflect peaceful rest or a break. 
Metaphorical Use
'Doldrums' can symbolize a lack of progress in various contexts, not just personal. 
Common Collocations
Frequently used with 'fall into', 'stuck in', or 'get out of' to describe entering or leaving the state. 